A man arrested by U.S. Customs and Immigration Enforcement died in a Nassau jail on Thursday, Newsday has learned.

County officials on Friday declined to share details about the 42-year-old man’s death but said an investigation is underway.

This marks the first known death of an ICE detainee under Nassau custody, and it has triggered several investigations.

"There is an ongoing investigation, which will be thorough and transparent to determine the cause of death," Nassau County Sheriff Anthony LaRocco, whose agency runs the jail, wrote in a statement to Newsday. "Nassau County takes seriously its obligation to treat every prisoner humanely."

The state attorney general’s office is conducting a preliminary assessment of the death, according to a spokesperson for Attorney General Letitia

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